PIPER
SENECA
II
SERVICE
MANUAL
d.
The stator contains a special lead which
is
connected to the center
of
the three phase windings.
The stator has been treated with a special epoxy varnish for high temperature resistance.
e.
The rotor contains the slip ring end bearing inner race and spacer on the slip ring end
of
the shaft.
The
rotor
winding and winding leads have been specially treated with a high temperature epoxy cement
to
provide vibration and temperature resistance characteristics. High temperature solder
is
used
to
secure the
winding leads to the slip rings.
f.
The drive end head supports a sealed, prelubricated ball bearing in which the drive end
of
the
rotor shaft rotates, and a blast tube connection for ventilation.
11-7.
CHECKING
ALTERNATOR
SYSTEM.
Two
ammeters
are
used which enable
an
independent
output
check
of
eac~
alternator,
as well as the electrical
output-input
of
the battery.
Should
either
alternator
show
no
output
on
its
ammeter,
check the
appropriate
circuit breakers. If a
further
check
of
the
ammeters
show no
output
from
both
alternators,
check
the
alternator
system. (Refer
to
Combined
Schematic Figure
11-23.)
a.
Ascertain that the ammeters are operating properly.
b. Disconnect the battery lead(+) at the alternator.
c.
Disconnect field leads
at
the alternator.
d. Ascertain
that
all electrical units are
off
and battery
is
full charged.
e.
Turn on the master switch.
f.
To check the alternator
output
circuit, connect a voltmeter or 12-volt test light to the battery
lead and to ground. If a reading
of
approximately 12-volts registers on the voltmeter
or
the test lights, the
battery circuit
is
operational.
g.
Should there be
no
indication
of
voltage, trace back through the output circuit until voltage
is
indicated. A component that allows no voltage
to
pass through
it
should be replaced.
Revised:
3/16/81
ELECTRICAL
SYSTEM
2F24
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